Improvement in blind-stops



H.P. & N. c. MOFFETT.

Blind-Stops.

Patented Nov. 17,1874.

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HENRYP. MOFFETT AND NORMAN O. MOFFETT, OF DUBUQUE, IOWA.

IMPROVEMENT IN BLIND-STOPS.

Specification forming part of Letters Patent No. 156,937, dated November17, 1874; application filed loctober 31, 1874.

To all whom it may concern:

Be it known that we, HENRY P. MOFFETT, and NORMAN (J. MOFFETT, ofDubuque, in the county of Dubuque' and State of Iowa, have invented anew and valuable Improvement in Blind-Slat Operators; and we do herebydeclare that the following is a full, clear, and exact description ofthe construction and operation of the same, reference being bad to theannexed drawings, making a part of this specification, and to theletters and figures of reference marked thereon.

Figure l of the drawing is a representation of a front elevation,partsectional, of our blindslat operator; and Fig. 2 is a transverse vertical sectional view of-the same.

This invention has relation to means for operating Venetian-blind slats,so as to admit a greater or less degree of light, according to the wantsof the occupant of the room, without throwing up the sash.

The object of the invention is not only to providemeansfor opening orshutting the slats, and to adapt the degreeof light to the wants of theoccupant of aroom, but also to preserve this adjustment when it has beenobtained,

and to this end the nature of the invention consists in combining, witha semicircular plate having a number of perforations circularly arrangednear'the edges thereof, a crankarm for opening and shutting the slats,the crank-shaft being endwise movable, and the crank-arm end madetapering,whereby the slats maybe opened more or less, and the requisiteadjustment obtained and maintained, as will be hereinafter more fullyexplained.

In the annexed drawings, A designates a Venetian blind, the slats a ofwhich are connected by a strip, B, so that all the said slats will openor close together. I) designates a rod, which is pivoted in any suitablemanner to the lower end of the strip B, and is looped at its lower endto receive the tapering end 0 of a crank-arm, O, of which the shaft 0has its bearings upon the window-sill D, passing.

through the sill-piece D into the interior of the apartment. The shaft 0is made endwise movable in its bearings, for a purpose which willhereinafter appear, and is terminated by F designates when the slats areopen a movement to the right or left will have the effect of closing thesaid slats, the closing being more or less pronounced, according to thedegree of revolution imparted to the shaft 0.

Whenthe requisite degree of openness of the said slats has beenobtained, admitting a certain degree of light, they may be held at thisadjustment by thrusting the tapering end 0 of crank-arm G into one ofthe perforations f of plate F, as shown in Fig. 2.

What we claim as new, and desire to secure by Letters Patent, is

The combination, with the pitman b and the endwise-movable crank-armshaft (3, of the plate F, having perforations f, substantially asspecified.

In testimony that we claim the above we have hereunto subscribed ournames in the presence of two witnesses.

' HENRY P. MOFFETT.

NORMAN U. MOFFETT. Witnesses:

WM. G. FARRAR, R. KOHAUS.

rigidly secured

